Fix 8x8dct in lossless encoding
Change V and H intra prediction in lossless (TransformBypassModeFlag == 1) macroblocks to correctly adhere to the specification. Affects lossless encoding with 8x8dct or mix of lossless with normal macroblocks. 8x8dct has already been disabled in lossless mode for some time due to being out-of-spec but this will allow us to re-enable it again.
Showing with 26 additions and 3 deletions